Honeywell Modutrol IV rotary actuators provide proportional modulation for dampers and valves, offering both spring-return and non-spring-return designs. With torque ratings from 25 to 300 lb‑in and adjustable stroke settings up to 160°, these reliable motors are widely used in HVAC, industrial burner systems, and control valve applications. They support current, voltage, 3-wire floating, or 135 Ω control input signals and include rugged, weather-resistant housings and quick-connect terminals.
Honeywell Modutrol IV heavy-duty rotary actuators are critical for precise damper positioning, burner firing rate control, and valve modulation. Because selecting the correct motor involves matching spring-return safety features, exact torque ratings (25 to 300 lb‑in), stroke angles (90° to 160°), and control input signals (4–20 mA, 2–10 VDC, 135 Ω, or floating), choosing the right replacement model is vital. Contact our technical sourcing team today to verify cross-references or source obsolete motors.
Honeywell’s Modutrol IV family features oil-immersed gear trains, NEMA 3 weather-resistant die-cast aluminum housings, and dual-ended drive shafts engineered for harsh HVAC and industrial combustion environments. Use this matrix to compare control types and torque classes.
| Motor Class | Control Signal & Operation | Common Series |
|---|---|---|
| M7284 / M7294 Series | Proportional electronic modulating (4–20 mA or 2–10 VDC), 150 to 300 lb‑in non-spring return actuators for heavy damper and valve automation. | M7284A1004, M7294A1010 |
| M6284 / M6184 Series | 3-wire SPDT floating or 2-position control with internal feedback potentiometers for precise manual or automated stepping. | M6284D1000, M6184D1035 |
| M9184 / M9185 Series | Series 90 proportional control motors utilizing 135 Ω potentiometer circuits in legacy heating and air-handling installations. | M9184D1013, M9185D1004 |
| M8185 / M4185 Series | Two-position line (120V) or low voltage (24V) spring-return fail-safe motors providing 60 lb‑in shut-off force upon power loss. | M8185D1006, M4185A1001 |
Modulating Commercial Valve & Damper Drive Kit
High-Torque Fail-Safe Burner & Valve Package
Torque & Shaft Configuration Alert: Modutrol IV actuators feature dual-ended shafts (slotted and tapped at both ends) and field-adjustable stroke potentiometers (90° to 160°). When replacing legacy Modutrol III or Series 90 units, confirm that stroke limits and input jumpers (4–20 mA vs 2–10 VDC) are configured prior to commissioning to avoid mechanical binding or gear strain.
Upgrading older Modutrol III or obsolete M944/M744 motors with modern Modutrol IV Series 2 units significantly improves overall system reliability. Modutrol IV motors feature brushless DC sub-motors, electronic microprocessor controls that eliminate the need for mechanical end-stops, and oil-immersed gear trains rated for over 60,000 full-stroke cycles.
Because modern Modutrol IV actuators ship with dual-ended drive shafts and standard 220738A height adapter brackets, replacing vintage actuators requires zero sheet metal or piping adjustments. Both drive shafts deliver equal torque capacity, allowing normally closed spring-return units to actuate normally open dampening dampers if mounted from the auxiliary end.
Pairing your Modutrol IV motor with a linear steam/water valve or butterfly valve assembly? Read our comprehensive technical guide on:
Honeywell Valve Linkages (Q5020, Q5024, Q5001, and Direct-Couple Connections)
Unsure of your motor torque, stroke rating, or replacement cross-reference?
Take a photo of your existing motor nameplate, damper linkage footprint, or wiring diagram, and our engineering sales team will cross-reference the exact modern Modutrol equivalent.
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